That's a good start, although you'd want Extra Head instead of Peripheral Vision. Compartmentalized Mind is optional - depends on if you really need to charm both heads to control it, for example. Otherwise Extra Head has that covered pretty well.

If you play the "two heads will argue" type, then yeah, you'll need Compartmentalized Mind. Of course, that potentially makes them much nastier, if they find some mental power to use.

Personally, I find the "make the heads argue" thing kind of funny but not enough to implement it. Too much "three headed giant" from Holy Grail and not enough power addition for the multi-headed creature. Instead of making multiple heads an advantage, it makes it a serious weakness to be exploited, and I'm adding the extra heads to make it stronger, not weaker.